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Old 06-21-2015, 06:16 PM   #1
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89 ethanol free

Hey everyone I have been running 93 in my car since new and have about 6600 miles now. I just found out we have a new has station and they offer ethanol free 89 octane. Would I see any benefits or negatives from going to that instead of the 93 with ethanol?




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Old 06-23-2015, 12:35 AM   #2
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Stay 93,safer

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Old 06-23-2015, 12:50 AM   #3
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Safer from what? I would go with 89 ethanol free. It's not in there because it makes nice things happen to our motors.
It's actually pretty harsh stuff on smaller ones like lawn mowers, boat motors, weed wackers, chain saws etc.
Your engine isn't any cleaner or better kept just because you've run 93 since she was born, that's silly. She just makes a few more bang giggles with 93.
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Old 06-23-2015, 03:01 AM   #4
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Are you tuned?
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Old 06-23-2015, 03:54 AM   #5
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No tune pretty much all stock


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Old 06-23-2015, 04:02 AM   #6
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Premium gas is required for 5.0 motor's? I thought so. I have an 87 octane tune & the tune likes
89 octane gas. I have a Cyclone motor.
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Old 06-23-2015, 04:11 AM   #7
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It's recommended for the 5.0 to get full horsepower. If you run less the horsepower decreases and the motor pulls timing.


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Old 06-23-2015, 04:18 AM   #8
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91/93 octane is required for maximum performance with the factory tune, but 87/89 can be used. You really only need to worry about it when you're tuned for a specific grade of fuel.

With that said, I always ran 91 with my car when I was stock. I felt better running it with the stock 11:1 compression. Less chance of pre-detonation.
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Old 06-23-2015, 05:01 AM   #9
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Although I do run 91 or even 93 when it's available where I live, I know I'm not using the extra 10 or whatever extra horsepower in my daily driving. I know it's not cleaner, it's not keeping my car mint, keeping my injectors or valves in any better shape than 87
BUT
I suffer from placebo effect on the gas issue....I feel like I'm treating my car. I feel like it's meticulously maintained and runs smoother and sounds better. It doesn't. But I feel better driving it anyway and that is a large part of driving enjoyment.
It's worth the extra couple bucks at the pump for me. But if I had a choice of a few less octanes for ethanol free, I would do that instead. But I would miss those octanes because octanes sounds similar to oxygen and conjures images of super power molecules etc.
It's science yo.
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Old 06-23-2015, 06:22 AM   #10
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I would run ethanol free 89 octane before I would run a higher octane with ethanol in it. I used regular gas in my 5.0 and never had any problem with it. And since ethanol free gas has more energy in a gallon of gas then gas mixed with ethanol you will probably not even loose those 10 HP.
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Old 06-23-2015, 09:04 AM   #11
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89 ethanol free

No ethanol fuel > fuel with ethanol
That is unless your car is built and tuned for E85. In this case it doesn't apply...
But a higher octane non ethanol fuel would be better than the 89...

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